From fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:14:29 +0200
Subject: Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 layout/painting/nsDisplayList.cpp | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

(limited to 'layout/painting/nsDisplayList.cpp')

diff --git a/layout/painting/nsDisplayList.cpp b/layout/painting/nsDisplayList.cpp
index 46f8b05f82..78388d2185 100644
--- a/layout/painting/nsDisplayList.cpp
+++ b/layout/painting/nsDisplayList.cpp
@@ -868,6 +868,11 @@ void nsDisplayListBuilder::SetIsRelativeToLayoutViewport() {
   UpdateShouldBuildAsyncZoomContainer();
 }
 
+void nsDisplayListBuilder::ForceLayerForScrollParent() {
+  mForceLayerForScrollParent = true;
+  mNumActiveScrollframesEncountered++;
+}
+
 void nsDisplayListBuilder::UpdateShouldBuildAsyncZoomContainer() {
   const Document* document = mReferenceFrame->PresContext()->Document();
   mBuildAsyncZoomContainer = !mIsRelativeToLayoutViewport &&
@@ -5974,7 +5979,8 @@ nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
       mPrerenderDecision(PrerenderDecision::No),
       mIsTransformSeparator(true),
       mHasTransformGetter(false),
-      mHasAssociatedPerspective(false) {
+      mHasAssociatedPerspective(false),
+      mContainsASRs(false) {
   MOZ_COUNT_CTOR(nsDisplayTransform);
   MOZ_ASSERT(aFrame, "Must have a frame!");
   Init(aBuilder, aList);
@@ -5990,7 +5996,8 @@ nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
       mPrerenderDecision(aPrerenderDecision),
       mIsTransformSeparator(false),
       mHasTransformGetter(false),
-      mHasAssociatedPerspective(false) {
+      mHasAssociatedPerspective(false),
+      mContainsASRs(false) {
   MOZ_COUNT_CTOR(nsDisplayTransform);
   MOZ_ASSERT(aFrame, "Must have a frame!");
   SetReferenceFrameToAncestor(aBuilder);
@@ -6007,7 +6014,8 @@ nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
       mPrerenderDecision(PrerenderDecision::No),
       mIsTransformSeparator(false),
       mHasTransformGetter(true),
-      mHasAssociatedPerspective(false) {
+      mHasAssociatedPerspective(false),
+      mContainsASRs(false) {
   MOZ_COUNT_CTOR(nsDisplayTransform);
   MOZ_ASSERT(aFrame, "Must have a frame!");
   MOZ_ASSERT(aFrame->GetTransformGetter());
@@ -6194,6 +6202,9 @@ Matrix4x4 nsDisplayTransform::GetResultingTransformMatrixInternal(
   NS_ASSERTION(frame || !(aFlags & INCLUDE_PERSPECTIVE),
                "Must have a frame to compute perspective!");
 
+  // IncrementScaleRestyleCountIfNeeded in ActiveLayerTracker.cpp is a
+  // simplified copy of this function.
+
   // Get the underlying transform matrix:
 
   /* Get the matrix, then change its basis to factor in the origin. */
@@ -6637,12 +6648,12 @@ bool nsDisplayTransform::CreateWebRenderCommands(
                                key};
 
   nsDisplayTransform* deferredTransformItem = nullptr;
-  if (!mFrame->ChildrenHavePerspective()) {
+  if (ShouldDeferTransform()) {
     // If it has perspective, we create a new scroll data via the
-    // UpdateScrollData call because that scenario is more complex. Otherwise
-    // we can just stash the transform on the StackingContextHelper and
-    // apply it to any scroll data that are created inside this
-    // nsDisplayTransform.
+    // UpdateScrollData call because that scenario is more complex. Otherwise,
+    // if we don't contain any ASRs then just stash the transform on the
+    // StackingContextHelper and apply it to any scroll data that are created
+    // inside this nsDisplayTransform.
     deferredTransformItem = this;
   }
 
@@ -6693,14 +6704,14 @@ bool nsDisplayTransform::CreateWebRenderCommands(
 
 bool nsDisplayTransform::UpdateScrollData(
     WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
-  if (!mFrame->ChildrenHavePerspective()) {
+  if (ShouldDeferTransform()) {
     // This case is handled in CreateWebRenderCommands by stashing the transform
     // on the stacking context.
     return false;
   }
   if (aLayerData) {
     aLayerData->SetTransform(GetTransform().GetMatrix());
-    aLayerData->SetTransformIsPerspective(true);
+    aLayerData->SetTransformIsPerspective(mFrame->ChildrenHavePerspective());
   }
   return true;
 }
-- 
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